I'm honestly surprised that we haven't gotten a new major villian yet, either as a new general, a replacement or a separate force. Also, I'm not counting Lymon's gang, since they were basically monsters of the week.

I liked what they did with Goseiger by not only having three villian groups seperate from each other but also having buredoron be not just a member of the three groups but also have his own faction as well.